filter out bogus entries from user feels lists

Before:

    > your recorded feels, listed by date:

            [  0 ] 2021-01-31 (1 word)      (nopub)
            [  1 ] .202-10-214.txt (3 words)
            [  2 ] .202-10-131.txt (1 word)

            ( page 1 of 1; type 'u' or 'd' to scroll up and down)

    pick an entry from the list, or type 'q' to go back:

After:

    > your recorded feels, listed by date:

            [  0 ] 2021-01-31 (1 word)      (nopub)

            ( page 1 of 1; type 'u' or 'd' to scroll up and down)

    pick an entry from the list, or type 'q' to go back:

ttbp/ttbp.py

@@ -854,7 +854,8 @@ def generate_feels_list(user):
         entryDir = os.path.join("/home", user, ".ttbp", "entries")
 
     for entry in os.listdir(entryDir):
-        filenames.append(os.path.join(entryDir, entry))
+        if core.valid(entry):
+            filenames.append(os.path.join(entryDir, entry))
     metas = core.meta(filenames)
     metas.sort(key = lambda entry:entry[4])
     metas.reverse()